(1)
（2）Session----Coolie
(3)
(4)
cookie保存
index.jsp
<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP ‘index.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"></head><body><h1>用户登录</h1><hr><%request.setCharacterEncoding("utf-8");String username = "";String password = "";Cookie[] cookies = request.getCookies();if (cookies != null && cookies.length > 0) {for (Cookie c : cookies) {if (c.getName().equals("username")) {//(名称)username=URLDecoder.decode(c.getValue(),"utf-8");}if( c.getName().equals("password")){password=URLDecoder.decode(c.getValue(),"utf-8");}}}%><form action="dologin.jsp" method="post" name="loginForm"><table><tr><td>用户名：</td><td><input type="text" name="username" value="<%=username %>" /> </td></tr><tr><td>密码：</td><td><input type="password" name="password" value="<%=password %>" /></td></tr><tr><td colspan="2" ><input type="checkbox" name="isUseCookie" checked="checkd" />十天内记住登陆状态</td></tr><tr><td colspan="2" aligin="center"><input type="submit" value="登录"></td></tr></table></form></body></html>
dologin.jsp
<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP ‘dologin.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"></head><body><h1>登陆成功</h1> <br><br><br><br><%request.setCharacterEncoding("utf-8");//防止中文乱码//首先判断用户是否选择了记录登陆状态String[] isUseCookie=request.getParameterValues("isUseCookie");//返回包含参数name的所有值的数组if(isUseCookie!=null&&isUseCookie.length>0){//吧用户名和密码保存在Cookie对象里面String username= URLEncoder.encode(request.getParameter("username"),"utf-8");//返回name指定函数的参数值//URLEncoder.encode(s, enc)防止中文乱码。。短码String password= URLEncoder.encode(request.getParameter("password"),"utf-8");Cookie usernameCookie=new Cookie("username",username);//创建cookie对象Cookie passwordCookie=new Cookie("password",password);usernameCookie.setMaxAge(8640000);//设置最大生存期限为10天(有效期)passwordCookie.setMaxAge(8640000);response.addCookie(usernameCookie);//加入cookie对象response.addCookie(passwordCookie);}else{Cookie[] cookies=request.getCookies();//读取cookie对象if(cookies!=null&&cookies.length>0){for(Cookie c:cookies){if(c.getName().equals("username")||c.getName().equals("password")){//(名称)c.setMaxAge(0);//设置cookie失效response.addCookie(c);//重新保存}}}}%><a href="users.jsp" target="_blank">查看用户信息</a></body></html>
users.jsp
<%@ page language="java" import="java.util.*,java.net.*"contentType="text/html; charset=UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP ‘users.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"></head><body><h1>用户信息</h1><br><br><br><br><%request.setCharacterEncoding("utf-8");String username = "";String password = "";Cookie[] cookies = request.getCookies();if (cookies != null && cookies.length > 0) {for (Cookie c : cookies) {if (c.getName().equals("username")) {//(名称)//解码用URLDecoder.decode(s, enc)username=URLDecoder.decode(c.getValue(),"utf-8");}if( c.getName().equals("password")){password=URLDecoder.decode(c.getValue(),"utf-8");}}}%>用户名：<%=username %><br> 密码：<%=password %><br></body></html>
(5)Session-Cookie
时间： 2024-11-05 14:38:16